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TitleIn situ, microanalytical sulphur and lead isotopic compositions of sulphide indicator minerals from surficial sediments in southwestern Northwest Territories
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AuthorKing, R D; Piercey, S J; Paulen, R C
SourceGeological Survey of Canada, Open File 8449, 2018, 14 pages, https://doi.org/10.4095/311247
Year2018
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
File formatreadme
File formatpdf (Adobe® Reader®); rtf; xlsx (Microsoft® Excel®)
ProvinceNorthwest Territories
NTS85C; 85D; 85E/01; 85E/02; 85E/03; 85E/4; 85E/05; 85E/06; 85E/07; 85E/08; 85E/09; 85E/10; 85E/11; 85E/12; 85F/01; 85F/02; 85F/03; 85F/04; 85F/05; 85F/06; 85F/07; 85F/08; 85F/09; 85F/10; 85F/11; 85F/12; 95A; 95B/01; 95B/02; 95B/07; 95B/08; 95B/09; 95B/10; 95B/15; 95B/16; 95G/01; 95G/02; 95G/07; 95G/08; 95G/09; 95G/10; 95H/01; 95H/02; 95H/03; 95H/04; 95H/05; 95H/06; 95H/07; 95H/08; 95H/09; 95H/10; 95H/11; 95H/12
AreaMackenzie River; Great Slave Lake; Sambaa K'e; Trout Lake; Ka'a'gee Tu; Kakisa Lake; Lue Túé Sulái; Jean Marie River; Tathlina Lake; Liard River
Lat/Long WENS-123.0000 -116.2500 61.6667 60.0000
Subjectseconomic geology; geochemistry; surficial geology/geomorphology; mineral deposits; sulphide deposits; gold; copper; lead; zinc; mineral occurrences; mineral exploration; exploration guidelines; mineralization; ore mineral genesis; drift prospecting; isotopic studies; lead isotope ratios; sulphur geochemistry; sphalerite; galena; chalcopyrite; arsenopyrite; source rocks; source areas; sediment dispersal; dispersal patterns; bedrock geology; lithology; igneous rocks; intrusive rocks; kimberlites; structural features; fault zones; faults; scanning electron microscope analyses; spectrometric analyses; mass spectrometer analysis; Pine Point Deposit; Western Canada Sedimentary Basin; Canadian Shield; Canadian Cordillera; Fort Simpson Formation; Olivut Kimberlite; Trout Lake Fault Zone; Rabbit Lake Fault Zone; Tathlina Fault Zone; Cameron Hills Structure; Howard's Pass Deposit; Selwyn Basin; Blende Deposit; Tom Deposit; Giant Mine; Meguma Gold Deposits; indicator minerals; mississippi valley type deposits; ediment-hosted deposits; orogenic deposits; sedimentary exhalative deposits; carbonate-hosted deposits; Phanerozoic; Cenozoic; Quaternary; Mesozoic; Cretaceous; Paleozoic; Devonian; Precambrian
Illustrationsgeoscientific sketch maps; plots; histograms
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Location
 
Natural Resources Canada Library - Ottawa (Earth Sciences)
 
ProgramMackenzie Corridor, Southern Mackenzie Surficial Mapping, GEM2: Geo-mapping for Energy and Minerals
Released2018 10 10
AbstractThis report presents analytical data from sphalerite, galena, chalcopyrite, and arsenopyrite grains recovered during recent surficial sampling programs in the region southwest of the headwaters of the Mackenzie River, Northwest Territories. Many samples were found to contain high numbers of sulphide mineral grains for which there is no known local source. Lead and S isotopic determinations were conducted to evaluate if the sulphide grains could have been transported from the nearest known source, the Pine Point Mississippi Valley-type district, or whether the grains are sourced from yet-to-be-discovered bedrock mineralization. Lead isotopic values from galena grains (207Pb/204Pb = 15.57 to 15.70; 206Pb/204Pb = 18.00 to 18.20) indicate a more radiogenic source than the Pine Point district and are, therefore, likely to have been locally sourced. Sulphur isotopic values from galena grains range from 0 to 27 permille delta-34S, comparable to Pine Point and other Mississippi Valley-type deposits globally, indicating that similar styles of mineralization may occur in the region. Chalcopyrite delta-34S values range from -22 to +28 permille, indicating that the grains are sourced from either sediment-hosted Cu or Manto-style mineralization. Arsenopyrite delta-34S values indicate a sulphur source similar to orogenic gold deposits near Yellowknife, Northwest Territories, and are likely derived from the Canadian Shield, north of the study area.
Summary(Plain Language Summary, not published)
As part of the Northwest Territories Protected Area Strategy (PAS) several candidate areas were assessed for the potential to host economic bedrock mineralization. Samples from these surveys yielded interesting results, with many samples containing elevated numbers of base metal indicator minerals. This data will assist in the efforts to learn about potential base-metal enriched sources that may occur in the region. Initial results of in situ sulfur and lead isotopic analyses of sulphide grains are reported and compared with previous studies.
GEOSCAN ID311247